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WASHINGTON (WUSA9) -- A day after the jubilant news that Mei Xiang, the Giant Panda at the National Zoo, gave birth to a healthy baby cub, came the sad news that her second cub was stillborn, officials said.

At around 7:30 p.m. on Saturday, Mei Xiang gave birth to a stillborn panda cub that was "never alive" according to a news release by zoo officials.

"Keepers watching Mei on the panda cam saw her groom it for 17 minutes. When she stopped grooming, it fell from Mei's body onto the floor of the den. It lay motionless and made no sound," zoo officials said.

Zoo officials believe the cub was never alive because they said, when the first cub was born, they could see it moving and they could hear it squealing, unlike the second cub that lay motionless on the ground.

"It was immediately evident that the cub had developmental abnormalities and wasn't fully formed. It was never alive. A necropsy is underway," zoo officials said.

The zoo is set to release results from the necropsy report on Sunday morning.